thomas



(No Model.) 2 Sheets-Sheet 2.

E. T. THOMAS. Sewing Machine. No. 242,234. Patented May 31,1881.

UNTTED STATES PATENT OFFICE.

EDDY T. THOMAS, OF NEW YORK, N. Y.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 242,234, dated May 31,1881.

Application tiled November 19, 1880. (No model.)

To all whom it may concern:

Beit known that I, EDDY T. THOMAS, of the city, county, and State of NewYork, have invented an Improved Sewing-Machine, of which the followingdescription, in connection with the accompanying drawings, is aspecification.

This invention relates to sewing-machines employing an eye-pointedneedle and shuttle; and my invention comprehends improvements in devicesfor moving the shuttle and four-motioned feeding device from a singleeccentric on the needle-bar-operating shaft by connectin g mechanism, aswill be hereinafter described. The shuttle-carrier rock-shaftismadeavailable as the shaft by which to actuate two independent cams, one ofwhich lifts the feedbar and permits it to fall at the proper times,while the other moves the feed-bar forward, a spring retractin g thesaid bar. In this myinvention these two cams are connected by a pin orstud on one entering a slot in the other cam, the said slot beingsufficiently larger than the diameter of the pin to permitmore or lesslost motion between the cams, so as to enable them to operate the feedin the proper sequence as to time.

In another application, No. 20,838, filed by me November 19, 1880, forUnited States Patent, I have shown a single cam-block for moving thefeed-bar.

Figure 1 represents, in vertical section, a sufficient portion of asewing-machine to illustrate my invention, the parts omitted from thedrawings being supposed to be common. Fig. 2 is a section of Fig. 1 onthe line cc m, the frame being broken out to show the feed-operatingspring. Fig. 3 is a longitudinal vertical section on the line cc x',Fig. 1. Fig. 4 is a section of Fig. 3 on the dotted line co2 m2, thesaid figure showing the cam d in section, and part of the cam c at therear of it through the opening 6 of cam d, the foot of lug c* being cutoff to show the lower end of c3 beyond it. Fig. 4 is a section on line:c3 w3 of Fig. 2. Fig. 5 is a detail showing the connecting-roddepending from the upper rotary shaft 3 Fig. 6, details of the feed-bar;Fig. 7, an enlarged side view of the two-Leed-operating cams in theposition they will occupy after the feed-bar has been raised and isbeginning to move forward. Fig. 8 represents, in detail, face views ofthe feedoperating cams in the positions they will occupy when thefeed-bar is retracted and lowered; Fig. 9, details ofthe same when thefeedbar is first lifted; Fig. 10, details of the same after the feed-barhas been moved forward; Fig. 11, details of the same when the feed-baris beginning to fallon its backward movement; Fig. 12, details showing,in top view and section, the cam for movin g the feed-bar forward; Fig.13, a top view of the feed-bar-lifting cam and its pin to engage andturn the cam to move the feed-bar forward. Fig. 14 represents, inelevation and partial section, a modified plan for actuating thefeed-cams; Fig. 15, a section of Fig. 14 on the dotted line x3, andFigs. 16 to 21 are details of the feed-cams in different positions.

The frame-work, including the cloth-plate a and overhanging arm a andthe rotating needle-bar-aetuatin g shaft a2, are and may be all asusual. The shaft a2 has an eccentric, a3, about which is placed theeccentric strap a4 of the link a5, connected at its lower end with theball a on a pin, ax, located at one end of the bell-crank lever al,pivoted at a8, and joined by the connecting-rod a9 with an arm of thevertically-placed vibrating shuttle-carrying lever Z1, secured to arock-shaft, b', the shuttle (not shown) to be moved by the saidshuttleearrying lever, having its face against the smooth wall lf2,which latter will be provided with the usual groove to receive theneedle and permit the loop of its thread to be thrown out in position tobe caught by the point ofV the shuttle. The rock-shaft b', (see Fig. 3,)having at one end a head, is entered loosely through the earn c, whichis to move forward the feedbar c', slotted to receive the guiding andsupporting pin c2; thence through the cam d, which will be fixed to theshaft, and which will lift the feed-bar and permit it to fall at theproper times 5 thence, also, loosely through the bearing c, and into ahole in the shuttle-carrier, to which it is iiXed by a pin, b3, orotherwise. The cam c, provided with a side incline, 2, (shown fully inFigs. 7 to l2, inelusive,) and placed loosely 011 the rock-shaft b', hasapplied to it a friction brake or device, c5, (shown in Fig. 4,) to keepthe said cam c at rest, except when positively turned by the pin 3,projected from. the cam d into the slot 4 in the hub of IOO the cam c.(See Figs. 2 and 7.) This slot-and pin connection enables the cam d,iixed on the shaft b', to first move and act on the leg c* of thefeed-bar, to raise or permit it to be lowered before the inclinedsurface 2 of cam c commences to act upon the leg c3 of the feed-bar tomove it forward, or to permit the feed-bar to be moved backward by thespring e2 on the pin 10, (see Fig. 2,) which acts to press the feedbarbackward after its usual serrated surface has dropped from contact withthe fabric. The rock-shaft b', being flxed with relation to theshuttle-carrier and loose in the bearing c, is made to turn the cams cland c at the proper times to impart to the feed-bar its usual 'fourmotions.

Fig. 8 shows the cams c clin the positions they will occupy when thefeed-bar is down and retracted. By the time the cam d reaches theposition Fig. 9 it will have lifted the serrated part of the feed-bar incontact with the fabric, and then the incline 2 of cam cwill commence toact on the leg c3 and move the feed-bar forward, and with it the fabric,the feed-bar being keptlifted by resting on the cam d, as in Fig. 10.The feed having taken place the roek-shaft is reversed, carrying with itthe cam d, the pin 3 of the said cam moving in the slot 4 of cam c,while the latter is held by the friction device c5, the cam d at thattime moving in the direction of the arrow next to it in Fig. 11, and assoon as the leg c4 enters the notch G the pin 3 takes hold of and turnsthe cam c, changing the position of its incline 2 so that the spring c2is free to move the feed-bar backward.

' In another application, iiled by lne on the 19th day of November,1880, I have shown auother plan for moving the feed from a rockshaft setin motion by the shuttle-carrier in its vibrations.

Referring to the modification, Figs. 1L to 2l, it will be noticed thatthe shuttle-carrier is attached to a tubular shaft, j', which carriesthe cam d, and that the cam c is connected willi a shaft, g, having acrank, g, provided with a pin, 3X, like pin 3 before referred to, saidpin 3X entering `a slot, 4", (see Fig. 15,) in the from theconnecting-rod a9, moves with it the tubular shaft and cam d to lift thefeed, as described of the cam d, before referred to, and at eachvibration the shuttle-carrier at the ends of the slot 4X strikes the piu3X extended therein, and turns the shaft g and the cam c to move thefeed-bar forward, as described of cam c, before referred to.

I elaiml. The shuttle-carrier, its connected rockshaft, and means tovibrate the shuttle-carrier and oscillate the rock-shaft with it,combined with the feed-bar and two independent cams on the saidrock-shaft, one fast thereon to raise the feed-bar and permit it tofall, and the other loose thereon and moving the feed-bar forward at theproper times, substantially as described.

2. In a sewing-machine, the feed-bar having two projections or legs, andthe twoindependcnt cams, one provided with a pin and the other with aslot, whereby one cam is made available to move the other, as described,one cam moving the feed-bar forward. while the other raisesitpreparatory to or as it is being moved forward, and permit it to fallat the proper time, combined with the rock-shaft, means to move it, anda suitable friction device to retard the movement of one of the saidcams, substantially as set forth.

3. In a sewing-machine, the rotating shaft a? in the overhanging arm,its eccentric a, the link a5, the elbowlever a", link a9, vibratingshuttle-carrier b, the shaftl b rocked by it, and the feed-bar, combinedwith the two independent cams c d, the one loose and the other xed uponthe said rock-shaft, and connected together by a pin-aud-slotconnection, all substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two sub scribing witnesses.

)Vitiiessess EDDY T. THOMAS.

THOMAS C. Do'rY, BERNARD J. KELLY.

